From
Knight’s KP1 Rifle The trigger group contains–you guessed it–the trigger, hammer, transfer bar, decocker, and associated coil springs, levers, and pins. It is removable–a nifty feature first found on Knight’s Revolution muzzleloader introduced several years ago.
“The removable trigger makes the gun so much easier to clean,” Simms said. “You can’t clean out the extremely corrosive blackpowder fouling unless you can get the trigger group out of the gun. We thought that was a big weakness in some other designs.”
A hardened dowel pin extends through the trigger-group housing and is attached to the trigger-release tab. Matching receiver cuts, barely visible when the trigger group is in place, allow the pin and the rest of the trigger group in and out of the receiver. When the trigger is replaced, the pin,
under the pressure of a coil spring, rides up small ramps cast into each side of the receiver to pull the trigger group into its recess.
Removing the trigger group can be accomplished with one hand. Simply grasp the trigger group between the thumb, which pushes the release tab just ahead of the trigger forward, and the index finger, which wraps around the front of the trigger guard. Then pull straight out. Replacing the unit is a little tricky. A little experimentation revealed the key was rocking the hammer back slightly and inserting the back end of the trigger group into the recess first.
Read more:
http://www.shootingtimes.com/l...00712/#ixzz3l7oxrv84 
